2 results about "Lead carbonate" patented technology

This invention belongs to the field of wet electrolytic refining technology for recycled lead, and provides a method for electrolytically preparing ultra-high purity lead. It involves constructing a 1-hydroxyethylidene-1,1-diphosphonic acid-modified lead carbonate seed layer on the cathode plate surface, combined with a bypass impurity removal unit to continuously remove impurity ions from the electrolyte, and then using staged current density electrolysis to ensure uniform nucleation and stable deposition of lead on the cathode surface. The resulting cathode lead has a purity of not less than 99.996 wt%, and the deposited layer is dense, flat, and has a low risk of inclusions. This method solves the problems of difficulty in balancing high-throughput deposition and ultra-high purity, as well as the difficulty in synchronizing seed layer adhesion stability and pollution control in existing processes. It is suitable for the high-value preparation of recycled lead from waste lead-acid batteries.

This invention relates to the field of chemical production, and particularly to a method for hydrometallurgical refining of lead from lead sulfide concentrate, comprising the following steps: Step S1: Catalytically oxidizing lead sulfide concentrate to obtain a first filtrate and a first filter residue; Step S2: Using an alkaline magnesium-based conversion agent to convert lead sulfate in the first filter residue into lead carbonate, obtaining a second filtrate and a second filter residue containing lead carbonate; Step S3: Leaching the lead carbonate in the second filter residue using an acetic acid solution and precipitating it with carbon dioxide to obtain high-purity lead carbonate; Step S4: Leaching the high-purity lead carbonate using a fluorosilicic acid solution and electrolyzing it to obtain metallic lead product. Compared with the prior art, the reagents used in this invention are low-cost and renewable, the reaction conditions are mild, no wastewater is generated, and the obtained metallic lead product has high purity.